Geologists divide this age into major and minor units of time that describe the kinds of geological processes and life forms that existed in them.Earth's geologic record was formed by constant change, just like those that occur routinely today.
Hutton called his theory that all rocks were the result of volcanic activity “Plutonism,” after the Roman god of the underworld.
Deposits from the tertiary age were made up of hills of gravel and sand, i.e., broken pieces of rocks that were formed in earlier ages.
The quaternary age is the current era, in which rocks and soils are still being deposited.
In the mid-seventeenth century, James Ussher (1581–1656), the Archbishop of Ireland, compiled a chronology of Earth by adding up the generations named in the Bible.
He determined that Earth was created the night before October 23, 4004 BC.